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	@Test
	public void databaseIsUsedIfDataIsPresent() {
		ExternalISBNDataService databaseService = mock(ExternalISBNDataService.class);
		ExternalISBNDataService webService = mock(ExternalISBNDataService.class);
		
		when(databaseService.lookup("0140177396")).thenReturn(new Book("0140177396","abc","abc"));
		
		StockManager stockManager = new StockManager();
		stockManager.setWebService(webService);
		stockManager.setDatabaseService(databaseService);
		
		String isbn = "0140177396";
		String locatorCode = stockManager.getLocatorCode(isbn);
		
		verify(databaseService).lookup("0140177396");
		verify(webService, never()).lookup(anyString());
		
	}